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Products & ServiceMarine engines

Weichai WP4.1 series marine diesel engine (40-60kW)

Parameters Table

Type Four-stroke, water cooled, in-line, turbocharged Number of cylinders 4
Cylinder Bore/stroke 105×118(mm) Displacement 4.09L
Oil consumption rate ≤0.6g/kW·h Noise ≤92dB(A)
Minimum fuel consumption rate 212g/kW·h Idle speed 650±30r/min
Rotation direction of crankshaft 
(facing the flywheel end)
Counter-clockwise Net weight 400kg
Dimensions Length × Width × Height 1062×625×918(mm)

Model Portfolio Table

Series Model Air intake mode Rated power
Fuel feeding Emission level Power classification
WP4.1 WP4.1C54-15 Turbocharged 40/54 1500 Mechanical pump - P1
WP4.1C68-15 Turbocharged 50/68 1500 Mechanical pump - P1
WP4.1C82-18 Turbocharged 60/82 1800 Mechanical pump - P1

Remark: Product parameters and model portfolio are for reference only. Please contact relevant personnel for official information on delivery time and fishing boat model portfolio. 

Product description

  Safe and reliable 

  • The overhaul period of high-strength engine block, crankshaft, connecting rod and cylinder head is 12000h
  • Rigorous and perfect test methods ensure the reliability of key parts and components

  Strong power

  • The torque reserve is as high as 20%-35%, the range of large torque section is wide, and the ships equipped with the engine will have good acceleration

  Economical and fuel-efficient

  • Reasonable allocation of oil pump, turbocharger, air intake and exhaust system; low oil consumption under common working conditions; good economical nature
  • With shallow ω combustion chamber, the best cylinder clearance and swirl ratio, the fuel consumption rate is as low as 212g/kW•h

  Comfortable and environmentally friendly 

  • The NVH optimization for the whole engine effectively reduces vibration and noise
  • There is no IMO emission requirement

  Strong practicability 

  • LCD Internet instrument can be selected to monitor engine operating parameters in real time, so as to realize automatic alarm and stop
  • It is suitable for marine engines such as passenger ships, cargo ships, public service ships, fishing boats and tourist ships
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R & D

20000 +
Global R & D personnel
R & D institutions in five countries, ten regions


  • 5,000,000 units
  • 22-10000Ps
  • 200 million kilowatts
  • Application for all markets